Damassa, 1997
From dinoflaj3
Damassa, S.P., 1997: Dinoflagellate cysts without walls: Evittosphaerula paratabulata Manum, 1979 and Chaenosphaerula magnifica gen. et sp. nov. from Deep Sea Drilling Project Site 338, Norwegian Sea. Review of Palaeobotany and Palynology, v.98, p.159-176, pl.1-3.